The animals, which cause harmful effect on human comforts, ease and economic profit is called pests. These animals disturb human beings in different ways. Among them some insects cause damage to a great extent to the crops in the fields. Of these two of each of the paddy and jute insects, along with their local and scientific names, the amount of their harmful effects and methods of control are discussed here.

(a) Yellow stem borer of paddy: The scientific name of Yellow stem borer is Scirpophaga Mcertulus; the adult moth is yellow in colour. Female moth lays eggs on paddy. Larvae or caterpillar hatches from egg and comes out by piercing the stein and enters within it. It needs 35-46 days to convert a larva into pupa and 6-10 days are needed to convert the Yellow stein borer into adult insects.

Harmful effect: Due to eating of stem the plant dries out and dies.

Fig: Yellow stem borer

Control or method of remedy:

(a) Biological control: The eggs are to be destroyed by hands.

(b) Chemical method: The insect is to be killed by proper insecticides.

(b) Rice hispa of paddy: Its scientific name is Dicladispa arnigera. They are black in colour and have got spines on the back.

Fig: Rice hispa

The female insects lay eggs on the leaf of paddy plant. Within 3 days larva comes out which becomes a pupa within 9-12 days, being brown in colour. Pupa becomes adult insect within 3-4 days and lives for 9-12 days.

Harmful effect: Larvae and adult insect eat up the green portion of paddy leaf which dries up and becomes white due to the absence of green parts as there is no photosynthesis and these results in the damage of the plant and the production becomes less.